// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*/
#include <linux/edac.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/soc/qcom/llcc-qcom.h>
#include "edac_mc.h"
#include "edac_device.h"
#define EDAC_LLCC "qcom_llcc"
#define LLCC_ERP_PANIC_ON_UE 1
#define TRP_SYN_REG_CNT 6
#define DRP_SYN_REG_CNT 8
#define LLCC_LB_CNT_MASK GENMASK(31, 28)
#define LLCC_LB_CNT_SHIFT 28
/* Mask and shift macros */
#define ECC_DB_ERR_COUNT_MASK GENMASK(4, 0)
#define ECC_DB_ERR_WAYS_MASK GENMASK(31, 16)
#define ECC_DB_ERR_WAYS_SHIFT BIT(4)
#define ECC_SB_ERR_COUNT_MASK GENMASK(23, 16)
#define ECC_SB_ERR_COUNT_SHIFT BIT(4)
#define ECC_SB_ERR_WAYS_MASK GENMASK(15, 0)
#define SB_ECC_ERROR BIT(0)
#define DB_ECC_ERROR BIT(1)
#define DRP_TRP_INT_CLEAR GENMASK(1, 0)
#define DRP_TRP_CNT_CLEAR GENMASK(1, 0)
#define SB_ERROR_THRESHOLD 0x1
#define SB_ERROR_THRESHOLD_SHIFT 24
#define SB_DB_TRP_INTERRUPT_ENABLE 0x3
#define TRP0_INTERRUPT_ENABLE 0x1
#define DRP0_INTERRUPT_ENABLE BIT(6)
#define SB_DB_DRP_INTERRUPT_ENABLE 0x3
#define ECC_POLL_MSEC 5000
enum {
LLCC_DRAM_CE = 0,
LLCC_DRAM_UE,
LLCC_TRAM_CE,
LLCC_TRAM_UE,
};
static const struct llcc_edac_reg_data edac_reg_data[] = {
[LLCC_DRAM_CE] = {
.name = "DRAM Single-bit",
.reg_cnt = DRP_SYN_REG_CNT,
.count_mask = ECC_SB_ERR_COUNT_MASK,
.ways_mask = ECC_SB_ERR_WAYS_MASK,
.count_shift = ECC_SB_ERR_COUNT_SHIFT,
},
[LLCC_DRAM_UE] = {
.name = "DRAM Double-bit",
.reg_cnt = DRP_SYN_REG_CNT,
.count_mask = ECC_DB_ERR_COUNT_MASK,
.ways_mask = ECC_DB_ERR_WAYS_MASK,
.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
},
[LLCC_TRAM_CE] = {
.name = "TRAM Single-bit",
.reg_cnt = TRP_SYN_REG_CNT,
.count_mask = ECC_SB_ERR_COUNT_MASK,
.ways_mask = ECC_SB_ERR_WAYS_MASK,
.count_shift = ECC_SB_ERR_COUNT_SHIFT,
},
[LLCC_TRAM_UE] = {
.name = "TRAM Double-bit",
.reg_cnt = TRP_SYN_REG_CNT,
.count_mask = ECC_DB_ERR_COUNT_MASK,
.ways_mask = ECC_DB_ERR_WAYS_MASK,
.ways_shift = ECC_DB_ERR_WAYS_SHIFT,
},
};
static int qcom_llcc_core_setup(struct llcc_drv_data *drv, struct regmap *llcc_bcast_regmap)
{
u32 sb_err_threshold;
int ret;
/*
* Configure interrupt enable registers such that Tag, Data RAM related
* interrupts are propagated to interrupt controller for servicing
*/
ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
TRP0_INTERRUPT_ENABLE,
TRP0_INTERRUPT_ENABLE);
if (ret)
return ret;
ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->trp_interrupt_0_enable,
SB_DB_TRP_INTERRUPT_ENABLE,
SB_DB_TRP_INTERRUPT_ENABLE);
if (ret)
return ret;
sb_err_threshold = (SB_ERROR_THRESHOLD << SB_ERROR_THRESHOLD_SHIFT);
ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_ecc_error_cfg,
sb_err_threshold);
if (ret)
return ret;
ret = regmap_update_bits(llcc_bcast_regmap, drv->edac_reg_offset->cmn_interrupt_2_enable,
DRP0_INTERRUPT_ENABLE,
DRP0_INTERRUPT_ENABLE);
if (ret)
return ret;
ret = regmap_write(llcc_bcast_regmap, drv->edac_reg_offset->drp_interrupt_enable,
SB_DB_DRP_INTERRUPT_ENABLE);
return ret;
}
/* Clear the error interrupt and counter registers */
static int
qcom_llcc_clear_error_status(int err_type, struct llcc_drv_data *drv)
{
int ret;
switch (err_type) {
case LLCC_DRAM_CE:
case LLCC_DRAM_UE:
ret = regmap_write(drv->bcast_regmap,
drv->edac_reg_offset->drp_interrupt_clear,
DRP_TRP_INT_CLEAR);
if (ret)
return ret;
ret = regmap_write(drv->bcast_regmap,
drv->edac_reg_offset->drp_ecc_error_cntr_clear,
DRP_TRP_CNT_CLEAR);
if (ret)
return ret;
break;
case LLCC_TRAM_CE:
case LLCC_TRAM_UE:
ret = regmap_write(drv->bcast_regmap,
drv->edac_reg_offset->trp_interrupt_0_clear,
DRP_TRP_INT_CLEAR);
if (ret)
return ret;
ret = regmap_write(drv->bcast_regmap,
drv->edac_reg_offset->trp_ecc_error_cntr_clear,
DRP_TRP_CNT_CLEAR);
if (ret)
return ret;
break;
default:
ret = -EINVAL;
edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
err_type);
}
return ret;
}
struct qcom_llcc_syn_regs {
u32 synd_reg;
u32 count_status_reg;
u32 ways_status_reg;
};
static void get_reg_offsets(struct llcc_drv_data *drv, int err_type,
struct qcom_llcc_syn_regs *syn_regs)
{
const struct llcc_edac_reg_offset *edac_reg_offset = drv->edac_reg_offset;
switch (err_type) {
case LLCC_DRAM_CE:
syn_regs->synd_reg = edac_reg_offset->drp_ecc_sb_err_syn0;
syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
break;
case LLCC_DRAM_UE:
syn_regs->synd_reg = edac_reg_offset->drp_ecc_db_err_syn0;
syn_regs->count_status_reg = edac_reg_offset->drp_ecc_error_status1;
syn_regs->ways_status_reg = edac_reg_offset->drp_ecc_error_status0;
break;
case LLCC_TRAM_CE:
syn_regs->synd_reg = edac_reg_offset->trp_ecc_sb_err_syn0;
syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
break;
case LLCC_TRAM_UE:
syn_regs->synd_reg = edac_reg_offset->trp_ecc_db_err_syn0;
syn_regs->count_status_reg = edac_reg_offset->trp_ecc_error_status1;
syn_regs->ways_status_reg = edac_reg_offset->trp_ecc_error_status0;
break;
}
}
/* Dump Syndrome registers data for Tag RAM, Data RAM bit errors*/
static int
dump_syn_reg_values(struct llcc_drv_data *drv, u32 bank, int err_type)
{
struct llcc_edac_reg_data reg_data = edac_reg_data[err_type];
struct qcom_llcc_syn_regs regs = { };
int err_cnt, err_ways, ret, i;
u32 synd_reg, synd_val;
get_reg_offsets(drv, err_type, ®s);
for (i = 0; i < reg_data.reg_cnt; i++) {
synd_reg = regs.synd_reg + (i * 4);
ret = regmap_read(drv->regmaps[bank], synd_reg,
&synd_val);
if (ret)
goto clear;
edac_printk(KERN_CRIT, EDAC_LLCC, "%s: ECC_SYN%d: 0x%8x\n",
reg_data.name, i, synd_val);
}
ret = regmap_read(drv->regmaps[bank], regs.count_status_reg,
&err_cnt);
if (ret)
goto clear;
err_cnt &= reg_data.count_mask;
err_cnt >>= reg_data.count_shift;
edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error count: 0x%4x\n",
reg_data.name, err_cnt);
ret = regmap_read(drv->regmaps[bank], regs.ways_status_reg,
&err_ways);
if (ret)
goto clear;
err_ways &= reg_data.ways_mask;
err_ways >>= reg_data.ways_shift;
edac_printk(KERN_CRIT, EDAC_LLCC, "%s: Error ways: 0x%4x\n",
reg_data.name, err_ways);
clear:
return qcom_llcc_clear_error_status(err_type, drv);
}
static int
dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
{
struct llcc_drv_data *drv = edev_ctl->dev->platform_data;
int ret;
ret = dump_syn_reg_values(drv, bank, err_type);
if (ret)
return ret;
switch (err_type) {
case LLCC_DRAM_CE:
edac_device_handle_ce(edev_ctl, 0, bank,
"LLCC Data RAM correctable Error");
break;
case LLCC_DRAM_UE:
edac_device_handle_ue(edev_ctl, 0, bank,
"LLCC Data RAM uncorrectable Error");
break;
case LLCC_TRAM_CE:
edac_device_handle_ce(edev_ctl, 0, bank,
"LLCC Tag RAM correctable Error");
break;
case LLCC_TRAM_UE:
edac_device_handle_ue(edev_ctl, 0, bank,
"LLCC Tag RAM uncorrectable Error");
break;
default:
ret = -EINVAL;
edac_printk(KERN_CRIT, EDAC_LLCC, "Unexpected error type: %d\n",
err_type);
}
return ret;
}
static irqreturn_t llcc_ecc_irq_handler(int irq, void *edev_ctl)
{
struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
struct llcc_drv_data *drv = edac_dev_ctl->dev->platform_data;
irqreturn_t irq_rc = IRQ_NONE;
u32 drp_error, trp_error, i;
int ret;
/* Iterate over the banks and look for Tag RAM or Data RAM errors */
for (i = 0; i < drv->num_banks; i++) {
ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->drp_interrupt_status,
&drp_error);
if (!ret && (drp_error & SB_ECC_ERROR)) {
edac_printk(KERN_CRIT, EDAC_LLCC,
"Single Bit Error detected in Data RAM\n");
ret = dump_syn_reg(edev_ctl, LLCC_DRAM_CE, i);
} else if (!ret && (drp_error & DB_ECC_ERROR)) {
edac_printk(KERN_CRIT, EDAC_LLCC,
"Double Bit Error detected in Data RAM\n");
ret = dump_syn_reg(edev_ctl, LLCC_DRAM_UE, i);
}
if (!ret)
irq_rc = IRQ_HANDLED;
ret = regmap_read(drv->regmaps[i], drv->edac_reg_offset->trp_interrupt_0_status,
&trp_error);
if (!ret && (trp_error & SB_ECC_ERROR)) {
edac_printk(KERN_CRIT, EDAC_LLCC,
"Single Bit Error detected in Tag RAM\n");
ret = dump_syn_reg(edev_ctl, LLCC_TRAM_CE, i);
} else if (!ret && (trp_error & DB_ECC_ERROR)) {
edac_printk(KERN_CRIT, EDAC_LLCC,
"Double Bit Error detected in Tag RAM\n");
ret = dump_syn_reg(edev_ctl, LLCC_TRAM_UE, i);
}
if (!ret)
irq_rc = IRQ_HANDLED;
}
return irq_rc;
}
static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl)
{
llcc_ecc_irq_handler(0, edev_ctl);
}
static int qcom_llcc_edac_probe(struct platform_device *pdev)
{
struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
struct edac_device_ctl_info *edev_ctl;
struct device *dev = &pdev->dev;
int ecc_irq;
int rc;
rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
if (rc)
return rc;
/* Allocate edac control info */
edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
llcc_driv_data->num_banks, 1,
edac_device_alloc_index());
if (!edev_ctl)
return -ENOMEM;
edev_ctl->dev = dev;
edev_ctl->mod_name = dev_name(dev);
edev_ctl->dev_name = dev_name(dev);
edev_ctl->ctl_name = "llcc";
edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;
/* Check if LLCC driver has passed ECC IRQ */
ecc_irq = llcc_driv_data->ecc_irq;
if (ecc_irq > 0) {
/* Use interrupt mode if IRQ is available */
rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
if (!rc) {
edac_op_state = EDAC_OPSTATE_INT;
goto irq_done;
}
}
/* Fall back to polling mode otherwise */
edev_ctl->poll_msec = ECC_POLL_MSEC;
edev_ctl->edac_check = llcc_ecc_check;
edac_op_state = EDAC_OPSTATE_POLL;
irq_done:
rc = edac_device_add_device(edev_ctl);
if (rc) {
edac_device_free_ctl_info(edev_ctl);
return rc;
}
platform_set_drvdata(pdev, edev_ctl);
return rc;
}
static void qcom_llcc_edac_remove(struct platform_device *pdev)
{
struct edac_device_ctl_info *edev_ctl = dev_get_drvdata(&pdev->dev);
edac_device_del_device(edev_ctl->dev);
edac_device_free_ctl_info(edev_ctl);
}
static const struct platform_device_id qcom_llcc_edac_id_table[] = {
{ .name = "qcom_llcc_edac" },
{}
};
MODULE_DEVICE_TABLE(platform, qcom_llcc_edac_id_table);
static struct platform_driver qcom_llcc_edac_driver = {
.probe = qcom_llcc_edac_probe,
.remove_new = qcom_llcc_edac_remove,
.driver = {
.name = "qcom_llcc_edac",
},
.id_table = qcom_llcc_edac_id_table,
};
module_platform_driver(qcom_llcc_edac_driver);
MODULE_DESCRIPTION("QCOM EDAC driver");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux